Graphite

Q.

Graphite is a good conductor of electricity because it has

1. delocalised electrons.
2. no electrons.
3. localised electrons.
4. delocalised protons.

Q.

How does graphite conduct electricity?

Q.

Which of the following is Network Solid?

1. ${\mathrm{I}}_2$

2. Diamond

3. Water(Ice)

4. ${\mathrm{SO}}_2$(solid)

Q.

Draw the structure of graphite and diamond. Explain how the structures are responsible for the difference in their physical properties.

Q.

Graphite is a soft lubricant extremely difficult to melt. What is the reason for this anomalous behaviour?

Q. Graphite has a melting point than/to that of diamond.

1. higher
2. lower
3. equal

Q. How does graphite act as a lubricant ?

Q. WHY DIAMOND HAVE HIGH MELTING POINT?
PLEASE PROVIDE EXPLANATION OF THE SAME.

Q.

The pencil leads are made of mainly :
(a) lithium (b) charcoal (c) lead (d) graphite

Q.

Name an allotrope of carbon which contains both single and double bonds between carbon atoms.

1. Graphite

2. diamond

3. Fullerene

4. Both A and C

Q.

Graphite is a poor conductor of electricity.

1. True
2. False

Q.

Does graphite conduct electricity?

Q. Graphite is a good conductor of electricity? Justify

Q.

Number of free electron(s) in each carbon atom in graphite is/are:

1. 1
2. 3
3. 2
4. 4

Q.

(a) What is graphite? Of what substance is graphite made?
(b) Describe the structure of graphite with the help of a labelled diagram.
(c) Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?
(d) State any two uses of graphite.

Q. Graphite is a soft lubricant extremely which is difficult to melt. What is the reason for this anomalous behaviour?

1. Strong covalent bonds in the sheet-like structure but weak force between the layers.
2. Strong covalent bonds in the sheet-like structure and strong force between the layers.
3. Weak covalent bonds in the sheet-like structure and weak force between the layers.
4. Weak covalent bonds in the sheet-like structure but strong force between the layers.

Q.

Name the element whose allotropic form is Graphite.

Q.

An allotrope of carbon that is as tensile as steel is?

Q. Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit ?

Q.

What makes graphite a good conductor of electricity?

Q.

Which of the following statements is not applicable to carbon compounds?

1. They have low melting and boiling points.

2. They are ionic in nature.

3. They form homologous series.

4. They are generally soluble in organic solvents.

Q.

How many electrons are shared between carbon and hydrogen in CH₄ ?

1. 6

2. 8

3. 2

4. 4

Q.

_________, __________ and _____________ are three crystalline forms of carbon.

Q.

Which of the following substances has free electrons to conduct electricity?

1. Wood
2. All the above
3. Diamond
4. Graphite

Q.

Write F for true and for false for the following statements

Being a nonmetal, graphite is a bad conductor of electricity.

1. True
2. False

Q. Name the element whose allotropic form is graphite.

Q.

Give reason graphite is soft and slippery in nature

Q. Identify the uses of graphite.

1. Dry lubricant
2. Lead pencil
3. Electrical wires
4. In crucibles

Q. What are allotropes? Sketch the structure of two allotropes of carbon namelydiamond and graphite. What is the impact of structure on physicalproperties of two allotropes?

Q.

Which of the following statement(s) is/are not applicable to carbon compounds?

1. They have low melting and boiling points.

2. They are ionic in nature.

3. They form homologous series.

4. They are generally soluble in organic solvents.